Brother MFC-8420 User Manual page 276

To change the destination application select the appropriate
application from the Application pull down list.
To change the other configuration options click the Link Preferences
button.
This option enables you to reduce image to screen resolution
(96dpi), show a warning if the item has annotations, update the
original item if sent item is modified, if needed.
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USING THE WINDOWS -BASED BROTHER SMARTUI CONTROL CENTER 15 - 24